Signs of polichnous deformations in microstructures of carbonate rocks of the Katav-Yuryuzan zone of transpression (Southern Urals)

Abstract

The Katav-Ivanovsk transpression zone experienced at least two stages of tectonic deformations, and the sequence of deformations was approximately the same throughout the entire zone — from the Bakal-Satka fault in the south to the Suleimsky fault in the north. Three stages of the formation of parageneses were identified. The parageneses of the first and the second stages were formed in a pure shear environment, and the paragenesis of the third stage — in a simple shear environment. There are stylolites (S₁) parallel to bedding, and mineral veins (V₁) in the paragenesis of the first stage. Paragenesis of the second stage combines stylolites (S₂), mineral veins (V₂) and intergranular cleavage (S₂). In paragenesis of the third stage were distinguished schistosity (S₃), milonites (S₃), cataclasites, mica packets (SC-textures), and the rotation structures of porphyroblasts.